I recently started a process of using rbd snapshots to setup a backup regime for a few file systems contained in RBD images. While this generally works well at the time of the snapshots there is a massive increase in latency (10ms to multiple seconds of rbd device latency) across the entire cluster. This has flow on effects for some cluster timeouts as well as general performance hits to applications. In research I have found some references to osd_snap_trim_sleep being the way to throttle this activity but no real guidance on values for it. I also see some other osd_snap_trim tunables (priority and cost). Is there any recommendations around setting these for a Jewel cluster? cheers, Adrian Confidentiality: This email and any attachments are confidential and may be subject to copyright, legal or some other professional privilege. They are intended solely for the attention and use of the named addressee(s). They may only be copied, distributed or disclosed with the consent of the copyright owner. If you have received this email by mistake or by breach of the confidentiality clause, please notify the sender immediately by return email and delete or destroy all copies of the email. Any confidentiality, privilege or copyright is not waived or lost because this email has been sent to you by mistake. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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